<?php
/**
* Smarty plugin
* @package Smarty
* @subpackage plugins
*/

/**
* 字符截取 Smarty truncate modifier plugin
* Type:     modifier<br>
* Name:     truncate<br>
* Purpose: Truncate a string to a certain length if necessary,
*           optionally splitting in the middle of a word, and
*           appending the $etc string or inserting $etc into the middle.
* @link   http://smarty.php.net/manual/en/language.modifier.truncate.php
*          truncate (Smarty online manual)
* @author   tianhm<tech at uenu dot com>
* @param string $string
* @param int $length
* @param string $code
* @param string $etc
* @return   string
*/
function smarty_modifier_truncate_cn($string, $length = 80, $etc = '...', $code = 'UTF-8')

{

    if ($length == 0)

        return '';

    if ($code == 'UTF-8') {

        $pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/";

    }

    else {

    $pa = "/[\x01-\x7f]|[\xa1-\xff][\xa1-\xff]/";

    }

    preg_match_all($pa, $string, $t_string);

    if (count($t_string[0]) > $length)

        return join('', array_slice($t_string[0], 0, $length)) . $etc;

    return join('', array_slice($t_string[0], 0, $length));

}

?>